A Study on Variation of Priestley-Taylor Model Parameter in Rain Fed Spring Maize Field

Abstract:

The study of Priestley-Taylor (PT) reference crop evapotranspiration model coefficient (α) in local is of great significance in semi-arid agricultural water resources efficient use and precision irrigation in corn. Here, based on the FAO (1998)-recommended Penman-Monteith (PM) reference crop evapotranspiration as a standard method, water and heat exchange and its estimated parameters were determined by eddy covariance technique and Priestley-Taylor model under local climatic conditions. The results indicated that the estimated values of reference crop evapotranspiration (ET_{0-PT 1.26}) in gained by PT mode-recommended coefficient (α = 1.26) lowed by 21.2% during non-growth stages (from November to April next year), and reached an average of 5.5% above PM model reference crop evapotranspiration (ET_0-PM) during May to September. The local PT model coefficient α value was 1.15 ± 0.06. The gained average PT mode coefficient at noon during growth stages showed a peak trend with the highest value 0.67 ± 0.08 at tasseling to flowering stage and with the lowest value 0.26 ± 0.13 at seedling stage. In conclusion, the reference crop evapotranspiration estimated accurately by PT mode in the semi-arid climate area, a local PT parameter is required to gain firstly.

• Periodical: Advanced Materials Research (Volume 740)
• Pages: 258-266
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.740.258
• Online since: August 2013
• Authors: Xu Rong Mei, Qiao Zhen Li, Chang Rong Yang, Yu Zhong Li, Jia Xuan Guo
• Keywords: Eddy Correlation Method, Priestley-Taylor Parameter, Rain Fed Spring Maize, Reference Crop Evapotranspiration

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